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Class 11 Humanities (Arts)

Geography – Indian Physical Environment

Structure and Physiography

Structure and Physiography

Action PlanNotesQuestionsMock-Test
Study Action Plan (Sorted by Difficulty)
Geomorphological Features of the Peninsular Plateau
Accuracy: 0%
Total Attempted0
Total Correct0
Total Incorrect0
Difficulty Level:
High
Coastal Plains and Island Geomorphology
Accuracy: 0%
Total Attempted1
Total Correct0
Total Incorrect1
Difficulty Level:
High
Indian Desert Geomorphology
Accuracy: 0%
Total Attempted2
Total Correct0
Total Incorrect2
Difficulty Level:
High
Indo-Ganga-Brahmaputra Plain Formation
Accuracy: 0%
Total Attempted2
Total Correct0
Total Incorrect2
Difficulty Level:
High
Himalayan Geomorphology
Accuracy: 20%
Total Attempted5
Total Correct1
Total Incorrect4
Difficulty Level:
High
Drainage Systems and River Valleys
Accuracy: 33%
Total Attempted3
Total Correct1
Total Incorrect2
Difficulty Level:
High
Physiographic Divisions of India
Accuracy: 40%
Total Attempted5
Total Correct2
Total Incorrect3
Difficulty Level:
High
Endogenic and Exogenic Forces
Accuracy: 50%
Total Attempted4
Total Correct2
Total Incorrect2
Difficulty Level:
Medium
Plate Tectonics and Indian Plate Movement
Accuracy: 50%
Total Attempted4
Total Correct2
Total Incorrect2
Difficulty Level:
Medium

Learning Objectives

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Learning Objectives

  • Understand the historical and ongoing movement of the Indian plate, including its separation from the Australian plate and its northward drift, and analyze its impact on the geological structure of the Indian subcontinent.
  • Analyze the physiographic divisions of India, focusing on the Peninsular Block, the Himalayas, and the Indo-Ganga-Brahmaputra Plain, and their distinct geological and geomorphological characteristics.
  • Examine the role of endogenic and exogenic forces in shaping the earth's surface, contributing to the formation of various landforms and geological structures in India.
  • Study the drainage systems of India, including the Himalayan and Peninsular rivers, and understand the formation of deltas and riverine features.
  • Explore the geomorphological features of the Peninsular Plateau, such as tors, block mountains, and rift valleys, and assess the impact of tectonic activities.
  • Investigate the geomorphology of the young, tectonically active Himalayan mountains, characterized by faults, folds, and rapid river erosion creating gorges and valleys.
  • Understand the formation of the Indo-Ganga-Brahmaputra Plain through sediment deposition in a geo-synclinal depression during the Himalayan orogeny.
  • Study the coastal plains of India, their geomorphological processes, and the formation and characteristics of island groups in the Bay of Bengal and Arabian Sea.
  • Examine the geomorphological features of the Great Indian Desert, including sand dunes, ephemeral rivers, and its historical marine influence.

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Revision Notes & Summary

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Chapter Notes

Plate Tectonics and Indian Plate Movement

  • Historical Movement: The Indian plate was originally located south of the equator and was part of a larger landmass that included the Australian plate.
  • Separation and Drift: Over millions of years, the Indian plate separated from the Australian plate and moved northwards.
  • Current Movement: The northward drift of the Indian plate continues today, significantly impacting the Indian subcontinent's geological structure.

Physiographic Divisions of India

  • Peninsular Block: Characterized by ancient gneisses and granites, it is a stable landmass with features like the Aravali hills and the Nallamala hills.
  • Himalayas: Young and tectonically active, marked by faults and folds, and dissected by fast-flowing rivers.
  • Indo-Ganga-Brahmaputra Plain: Formed by sediment deposition in a geo-synclinal depression, with significant alluvial deposits.

Endogenic and Exogenic Forces

  • Endogenic Forces: Internal forces that shape the earth's surface, contributing to the formation of mountains and other geological structures.
  • Exogenic Forces: External forces such as weathering and erosion that modify the earth's surface features.

Drainage Systems and River Valleys

  • Himalayan Rivers: Characterized by steep gradients and the formation of deep gorges and valleys.
  • Peninsular Rivers: Generally have shallow valleys with low gradients, forming deltas before entering the Bay of Bengal.

Geomorphological Features of the Peninsular Plateau

  • Features: Includes tors, block mountains, and rift valleys.
  • Tectonic Activity: The region has been subject to vertical movements and block faulting.

Himalayan Geomorphology

  • Characteristics: Young, tectonically active mountains with features like gorges and V-shaped valleys.
  • River Erosion: Rapid river erosion creates distinct landforms.

Indo-Ganga-Brahmaputra Plain Formation

  • Formation: Result of sediment deposition in a geo-synclinal depression during the Himalayan orogeny.
  • Alluvial Deposits: Depth ranges from 1,000-2,000 meters, supporting fertile agricultural land.

Coastal Plains and Island Geomorphology

  • Western Coastal Plains: Submerged coastal plains with natural ports and harbors.
  • Eastern Coastal Plains: Emergent coast with well-developed river deltas.
  • Islands: Andaman and Nicobar Islands in the Bay of Bengal, Lakshadweep in the Arabian Sea.

Indian Desert Geomorphology

  • Great Indian Desert: Features include sand dunes and ephemeral rivers.
  • Historical Marine Influence: Evidence of past marine conditions with features like mushroom rocks and oasis.
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Practice Test – MCQs, True/False

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Multiple Choice Questions

A.

Aravali Range

B.

Malda Fault

C.

Satpura Range

D.

Rajmahal Hills
Correct Answer: B

Solution:

The Malda Fault in West Bengal separates the northeastern parts from the Chotanagpur plateau.

Chapter Concept:

Physiographic Divisions of India

A.

Convergent boundary

B.

Divergent boundary

C.

Transform boundary

D.

Subduction zone
Correct Answer: B

Solution:

The separation of the Indian Plate from the Australian Plate represents a divergent boundary where the plates move apart, allowing the Indian Plate to drift northward.

Chapter Concept:

Plate Tectonics and Indian Plate Movement

A.

Shallow valleys with low gradients

B.

V-shaped valleys and gorges

C.

Wide deltas

D.

Braided channels
Correct Answer: B

Solution:

Himalayan rivers are known for their youthful stage, characterized by V-shaped valleys and gorges.

Chapter Concept:

Drainage Systems and River Valleys

A.

500-1000 m

B.

1000-2000 m

C.

2000-3000 m

D.

3000-4000 m
Correct Answer: B

Solution:

The average depth of alluvial deposits in the Indo-Ganga-Brahmaputra Plain ranges from 1000-2000 m.

Chapter Concept:

Indo-Ganga-Brahmaputra Plain Formation

A.

Presence of coral reefs

B.

Formation of extensive deltas

C.

Narrow and steep coastlines

D.

Submerged landforms
Correct Answer: B

Solution:

The eastern coastal plains of India are broader and characterized by the formation of extensive deltas by rivers such as the Mahanadi, Godavari, Krishna, and Kaveri.

Chapter Concept:

Coastal Plains and Island Geomorphology

A.

The Peninsular Block

B.

The Himalayas

C.

Indo-Ganga-Brahmaputra Plain

D.

The Coastal Plains
Correct Answer: A

Solution:

The Peninsular Block is formed essentially by a great complex of very ancient gneisses and granites.

Chapter Concept:

Physiographic Divisions of India

A.

Kayals (backwaters)

B.

Deltas

C.

Natural ports

D.

Coral reefs
Correct Answer: B

Solution:

The western coastal plains are submergent, which means they do not have deltas. Instead, they are characterized by narrow belts with natural ports.

Chapter Concept:

Coastal Plains and Island Geomorphology

A.

It created a series of volcanic islands.

B.

It led to the formation of extensive riverine plains.

C.

It resulted in the upliftment of the Western Ghats.

D.

It caused the submergence of coastal areas.
Correct Answer: B

Solution:

The northward movement of the Indian Plate contributed to the formation of the Indo-Ganga-Brahmaputra Plain, which is characterized by extensive riverine plains due to sediment deposition.

Chapter Concept:

Plate Tectonics and Indian Plate Movement

A.

Glacial erosion

B.

Wind erosion

C.

River erosion

D.

Volcanic activity
Correct Answer: C

Solution:

The fast-flowing rivers in their youthful stage in the Himalayas are responsible for the formation of gorges and V-shaped valleys.

Chapter Concept:

Himalayan Geomorphology

A.

Gorges

B.

Deltas

C.

Canyons

D.

Plateaus
Correct Answer: B

Solution:

The mouths of the rivers in the Indo-Ganga-Brahmaputra Plain form some of the largest deltas in the world, such as the Sunderbans delta.

Chapter Concept:

Indo-Ganga-Brahmaputra Plain Formation

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True or False

Correct Answer: False

Solution:

The western coastal plains of India are an example of a submerged coastal plain, not an emergent coast.

Chapter Concept :

Coastal Plains and Island Geomorphology

Correct Answer: False

Solution:

The Himalayas are formed by the interplay of both exogenic and endogenic forces, along with the lateral movements of tectonic plates.

Chapter Concept :

Himalayan Geomorphology

Correct Answer: True

Solution:

The Indo-Ganga-Brahmaputra Plain originated as a geo-synclinal depression which was filled by sediments during the Himalayan orogeny.

Chapter Concept :

Indo-Ganga-Brahmaputra Plain Formation

Correct Answer: True

Solution:

The western coastal plains are indeed an example of a submerged coastal plain, which is evidenced by the presence of natural ports and harbours along the coast.

Chapter Concept :

Coastal Plains and Island Geomorphology

Correct Answer: True

Solution:

The Peninsular Block is formed essentially by a great complex of very ancient gneisses and granites.

Chapter Concept :

Physiographic Divisions of India

Correct Answer: False

Solution:

The average depth of alluvial deposits in the Indo-Ganga-Brahmaputra Plain actually ranges from 1,000 to 2,000 meters.

Chapter Concept :

Indo-Ganga-Brahmaputra Plain Formation

Correct Answer: False

Solution:

The northward movement of the Indian plate is still continuing and it has significant consequences on the physical environment of the Indian subcontinent.

Chapter Concept :

Endogenic and Exogenic Forces

Correct Answer: True

Solution:

The Peninsular Plateau has undergone various tectonic activities, leading to the formation of geomorphological features like rift valleys and block mountains.

Chapter Concept :

Geomorphological Features of the Peninsular Plateau

Correct Answer: True

Solution:

The Peninsular rivers are characterized by shallow valleys and low gradients, as mentioned in the text.

Chapter Concept :

Drainage Systems and River Valleys

Correct Answer: False

Solution:

The Himalayas, unlike the Peninsular Block, are young, weak, and flexible in their geological structure, making them susceptible to the interplay of endogenic and exogenic forces. This results in the development of faults, folds, and thrust plains.

Chapter Concept :

Endogenic and Exogenic Forces

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